Have a C wire (conventional install)
Step 1. Turn off the power to your HVAC equipment
Before disconnecting the existing thermostat or installing the Smart Si thermostat, turn off the power to the heating and air conditioning equipment.
Step 2. Remove the existing thermostat
Disconnect the wires to the existing thermostat and remove it from the wall.
Step 3. Install your Smart Si
The ideal location for the thermostat is approximately 5 feet (1.5 m) above floor level in the main living area.
We recommend not installing the Smart Si:
Close to sources of heat such as incandescent lights
Near supply heating/cooling sources
In direct sunlight
On exterior, non-insulated or poorly insulated walls
In the kitchen or other areas of potentially high heat and/or humidity
In an area that could restrict air flow
To install the thermostat:
1. Gently separate the backplate from the thermostat
2. Place the thermostat backplate on the wall—make sure that any existing wires can be inserted through the opening for the wiring.
3. Using the backplate as a template, mark the location of the mounting holes on the wall as shown below
1. Move the backplate out of the way and make holes where indicated in step 3. The mounting holes can accommodate a #6 pan-head screw. It is recommended to use the included fasteners to ensure proper fitting of the front housing
2. Use the included drywall plugs (or other suitable anchors) to ensure the thermostat can be mounted securely to the wall
3. Fasten the backplate to the wall using the screws provided (or other suitable screws)
Step 4. Connect the wiring
You need to use low-voltage cable to connect the thermostat to the HVAC equipment. Check the wiring diagrams on pages 8 to 17 for the number of wires required.
Note: There is a factory installed jumper between R/H and R/C. Ensure any unused wires do not have exposed bare copper conductors.
To connect the thermostat to the equipment:
1. Connect the wires as shown in the wiring diagrams.
2. Attach the Smart Si thermostat to the backplate. Ensure that the pins on the thermostat align with the terminal block on the backplate.
Refer to our wiring diagrams for the Smart Si for instructions of how to wire the thermostat to various types of HVAC equipment.
Step 5. Restore the power to your HVAC equipment
After you’ve completed the wiring, you can apply power to the heating and air conditioning equipment. The Smart Si thermostat receives power from the equipment and will automatically power on.
No C Wire (PEK Install)
A common wire (C) is required for 5-wire thermostats. If there are only 4 wires to your existing thermostat (i.e. there is no C wire), you can use the ecobee Power Extender Kit to power your thermostat.
Step 1. Install wiring harness
The PEK wiring harness must be installed in an indoor, dry location near the HVAC equipment. When choosing a location, the distance between the wiring harness and the HVAC equipment must not exceed 24 inches (0.6 m).
Note: This equipment is sensitive to electrostatic discharge (ESD). Before starting, discharge your body of static electricity by touching a grounded metal object. Always hold the devices by their edges and do not touch any of the internal components.
1. Power off the HVAC equipment
2. Remove the top cover of the wiring harness by gently squeezing its sides
3. Use 2 #6 pan-head screws or double-sided adhesive to attach the wiring harness to a flat surface (for example, the furnace casing)
Step 2. Install diode
The diode is designed to be installed behind the thermostat, within the thermostat’s back panel wire opening.
1. Use your fingers to gently pry the thermostat away from its base
2. Using the thermostat’s back panel wire opening as a guide, gently bend the diode wires 90 degrees so that they can be inserted into the W O/B and Y terminals:
The diode itself should stay within the wire opening.
3. Clip the diode legs so that you can insert them into the W and Y terminals—do not over clip the legs
4. Connect the diode legs to the W O/B and Y terminals
Step 3. Connect the wires
The next step is to connect the wires between the thermostat, diode, wiring harness, and HVAC equipment.
1. Connect the C wire coming from the thermostat to the C terminal on the thermostat side of the wiring harness. You can re-purpose the wire that would have been connected to W on a 4-wire thermostat
2. Connect the RC/RH and G wires from the thermostat to the RC/RH and G terminals on the thermostat side of the wiring harness
3. Connect the output from the diode to the Y terminal on the thermostat side of the wiring harness. You can re-use the wire that would have been connected to Y on a 4-wire thermostat
4. Connect the RC/RH, G (fan), Y, C, and W wires on the equipment side of the wiring harness to the matching terminals on your air handler.
Step 4. Power on the system
After you have completed the wiring, you can power on and test the system.
1. Re-attach the thermostat to the backplate. Ensure that the pins on the thermostat align with the terminal block on the backplate
2. Power on the HVAC equipment—the thermostat should automatically power on
3. Test your wiring by alternately adjusting the set temperature and running the different heat, cool, and fan modes
4. Once you are satisfied the wiring is correct, re-attach the wiring harness’s front cover. Make sure the wires exit the module via the wire channel
5. Re-attach any cover panels that you previously removed on the HVAC equipment
Installing and Setting up Zigbee Module
Home Automation Features
The ZigBee Module lets your Smart Si thermostat communicate with ecobee Smart Plugs—Zigbee-enabled electrical outlets that you can control from your Smart Si thermostat. Once installed, you can view each Smart Plug’s energy consumption and weekly program, and turn each plug on or off from your personalized Web Portal. You only need one ZigBee Module per thermostat—it can connect to multiple Smart Plugs (up to 32).
Step 1. Install ZigBee Module
The Smart Si thermostat has a keyed connector, located near the battery, designed for the ZigBee Module.
To install the ZigBee Module:
This equipment is sensitive to electrostatic discharge (ESD). Before starting, discharge your body of static electricity by touching a grounded metal object. Always hold the devices by their edges and do not touch any of the internal components.
1. Using a flat-head screw driver, gently separate the Smart Si thermostat from its wall-mounted backplate. Once removed, lay the thermostat on a flat surface, with the internal components facing up.
2. Insert the plastic stand-off B that comes with the ZigBee Module C into the round hole in the thermostat circuit board, just above the battery.
3. Align the connector of the ZigBee Module to the connector on the Smart Si thermostat and gently push into place. The stand-off will secure the module and ensure it does not move.
4. Make sure the top of the plastic stand-off snaps through the ZigBee module, as shown in the illustration on the right.
5. Attach the Smart Si thermostat back onto the backplate on the wall.
Step 2. Install Smart Plug Into Outlet (Optional)
If you already have a Smart Plug, plug it into a standard household electrical outlet, then plug in a light or appliance. Ensure that the switch on the actual light or appliance is left in the ON position. Consult your Smart Plug Manual for information about placing the plug into network discovery mode.
Step 3. Set Up ZigBee Network
To use Smart Plugs, you will need to set up a ZigBee Home Automation network with your ecobee Smart Si thermostat.
To setup the ZigBee Home Automation network:
1. From the Home screen, press MENU
2. Select Settings ▶ ZigBeeModule(Internal) and then press OK.
3. Follow the prompts to configure Home Automation.
You may choose to add your smart plug at this time, as per the prompts or add the plug once the setup is complete.
Home Automation Options
Congratulations! Your ZigBee Home Automation network is now set up.
To view Home Automation details:
1. From the Home screen, press MENU.
2. Select Settings ▶ Home Automation and then press OK.
From the Home Automation menu, you can:
- View technical information about the network.
- View devices (i.e. Smart Plugs) currently connected to the network.
- Add new devices to the network
- Remove devices from the network.
Consult your Smart Plug Instruction manual for detailed information about configuring and using Smart Plugs. For general information about using your thermostat, consult your Smart Si thermostat User Manual.